Intel
82801BA ICH2 Datasheet
2-11
Signal Description
2.17
AC’97 Link
NOTE:
If the ACLINK Shutoff bit in the AC’97 Global Control Register (See
Section 13.2.8
) is set to 1, internal
pull-down resistors will be enabled on AC_BIT_CLK and AC_SDATA_IN[1:0]. If ACLINK Shutoff is
cleared to 0, these pull-down resistors are disabled. It there is no codec down on the system board, the
two signals AC_SDIN[1:0] should be pulled down externally with a resistor to ground.
2.18
General Purpose I/O
Table 2-17. AC’97 Link Signals
Name
Type
Description
AC_RST#
O
AC97 Reset:
Master H/W reset to external Codec(s)
AC_SYNC
O
AC97 Sync:
48 KHz fixed rate sample sync to the Codec(s)
AC_BIT_CLK
I
AC97 Bit Clock:
12.288 MHz serial data clock generated by the external
Codec(s). See Note.
AC_SDOUT
O
AC97 Serial Data Out:
Serial TDM data output to the Codec(s)
Note: AC_SDOUT is sampled at the rising edge of PWROK as a functional strap.
See
Section 2.20.1
for more details.
AC_SDIN[1:0]
I
AC97 Serial Data In 0:
Serial TDM data inputs from the Codecs. See Note.
Table 2-18. General Purpose I/O Signals
Name
Type
Description
GPIO[31:29]
O
Not implemented.
GPIO[28:27]
I/O
Can be input or output. Resume power well. Unmuxed.
GPIO[26]
I/O
Not implemented.
GPIO[25]
I/O
Can be input or output. Resume power well. Not Muxed.
GPIO[24]
I/O
Can be input or output. Resume power well.
GPIO[23]
O
Fixed as Output only. Main power well.
GPIO[22]
OD
Fixed as Output only. Main power well. Open-drain output.
GPIO[21]
O
Fixed as Output only. Main power well.
GPIO[20:18]
O
Fixed as Output only. Main power well.
GPIO[17:16]
O
Fixed as Output only. Main Power Well. Can instead be used for PC/PCI
GNT[A:B]#. GPIO[17] can also alternatively be used for PCI GNT[5]#. Integrated
pull-up resistor.
GPIO[15:14]
I
Not implemented.
GPIO[13:12]
I
Fixed as Input only. Resume Power Well. Not muxed.
GPIO[11]
I
Fixed as Input only. Resume Power Well. Can instead be used for SMBALERT#.
GPIO[10:9]
I
Not implemented.
GPIO[8]
I
Fixed as Input only. Resume Power Well. Not muxed.
GPIO[7]
I
Fixed as Input only. Main power well. Not muxed.
GPIO[6]
I
Fixed as Input only. Main power well.
GPIO[5]
Not implemented.
GPIO[4:3]
I
Fixed as Input only. Main power well. Can be used instead as PIRQ[G:F]#.
GPIO[2]
Not implemented.
GPIO[1:0]
I
Fixed as Input only. Main Power Well. Can instead be used for PC/PCI
REQ[A:B]#. GPIO[1] can also alternatively be used for PCI REQ[5]#.
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